Three-dimensional display with a multi-directional backlight

Zi-yin LI; Hai-feng LI; Xu LIU

doi:10.37188/CJLCD.2022-0031

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Three-dimensional display with a multi-directional backlight

Multiple Viewpoints 3D Display | 更新时间：2022-06-22

- Three-dimensional display with a multi-directional backlight
- Chinese Journal of Liquid Crystals and Displays Vol. 37, Issue 5, Pages: 598-604(2022)
- 作者机构：
  
  浙江大学光电科学与工程学院，浙江杭州 310027
- 作者简介：
- 基金信息：
- DOI：10.37188/CJLCD.2022-0031
  CLC： TN27;TN26
- Received：28 January 2022，
  
  Revised：18 February 2022，
  
  Published：05 May 2022
- 稿件说明：
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Zi-yin LI, Hai-feng LI, Xu LIU. Three-dimensional display with a multi-directional backlight[J]. Chinese journal of liquid crystals and displays, 2022, 37(5): 598-604.
DOI：

Zi-yin LI, Hai-feng LI, Xu LIU. Three-dimensional display with a multi-directional backlight[J]. Chinese journal of liquid crystals and displays, 2022, 37(5): 598-604. DOI： 10.37188/CJLCD.2022-0031.

摘要

为了实现低串扰、全分辨、多视点的三维显示效果，搭建了多指向型背光源的三维显示系统。本系统由人眼追踪模块获取双目位置并反馈到多指向型背光源和液晶显示屏，多指向型背光源和液晶显示屏协同时序产生快速切换的左右眼视差图像。由于人眼的视觉暂留效应，观看者可感知到三维图像。多指向型背光源主要由一列柱面光源和体全息光学器件实现，不同柱面光源经体全息光学器件将产生不同方向的衍射光束。为了改善本系统显示不均匀现象，提出了双LED式和扩散屏式两种方法。实验结果表明：本系统可提供全分辨的三维图像，且均匀度提高至80%，平均串扰值低至2.75%，实现了25个显示视点，满足了三维显示对串扰、分辨率、均匀度等方面的要求，观看者的视觉体验大幅提升。

Abstract

To realize three-dimensional（3D） images with low crosstalk， full resolution， and multi-view， a 3D display based on a multi-directional backlight is proposed. An eye-tracker in the system is used to acquire the position of human eyes and feedback to multi-directional backlight and the liquid crystal display （LCD） panel. Directional parallax images are time-sequentially provided to each eye by simultaneously working of multi-directional backlight and LCD screen. Viewers can achieve 3D perception based on the persistence of vision. Multi-directional backlight is mainly realized by a series of cylindrical waves and a holographic optical element （HOE）. Different cylindrical waves produce diffracted beams in different directions through HOE. Double-LED type and diffuser type are proposed to improve the uniformity of the proposed system. Experimental results indicate that this system can provide full resolution 3D images in 25 viewing zones， and the uniformity is improved to 80%， average crosstalk is as low as 2.75%， which satisfy the demands for crosstalk， resolution， uniformity in the 3D display system， and the visual experience of viewers is greatly improved.

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